Shell Programming and Scripting

*****@********[/home/aiw1]>echo $mynumber                                                         
vout123
*****@********[/home/aiw1]>if [ $mynumber == 'vout[0...252]' ]                                      
> then
> echo 't'
> else
> echo 'f'
> fi
f

$ myfile=vout123
$ export myfile
$ perl -e 'if ($ENV{myfile}=~/vout(\d+)/ && $1 >0 && $1 <253){print "t\n";}'
t
$

case "$VAR" in
abcd[0-9])  echo stuff ;;
abcd[1-9][0-9])  echo stuff ;;
abcd1[0-9][0-9]) echo stuff ;;
abcd2[1-4][0-9]) echo stuff ;;
abcd25[0-2]) echo stuff ;;
*) echo "not matched" ;;
esac

echo $VAR | awk '/[a-z]{3}[0-9]{3}/ {print "Matched"}; /![a-z]{3}[0-9]{3}/ {print "NOT matched"}'

$ echo $mynumber
vout123
$ if [ ${mynumber#????} -ge 0 ] && [ ${mynumber#????} -le 252 ]
> then
>    echo 't'
> else
>    echo 'f'
> fi
t